England manager Roy Hodgson awoke on Friday morning to news of another injury scare for his star striker.
Just a few weeks after Rooney suffered a toe injury, Hodgson learned the Manchester United forward had suffered a groin problem in training.
Rooney's last two World Cup campaigns have been hindered by metatarsal and ankle injuries suffered weeks before kick-off, but United's interim manager Ryan Giggs played down the scale of the injury at his weekly press conference on Friday morning.
"A few of the lads have had a bug," Giggs said ahead of Saturday's game against Sunderland at Old Trafford.
"Anders Lindegaard has the bug and so does Wayne, who also has a tight groin.
"You have to be careful with the bug because the immune system is down a bit but Wayne, being Wayne, wants to be involved and wants to play.
"We will have to monitor it over the next 24 hours."
Sources close to Rooney insisted the injury would not put the striker's World Cup chances in jeopardy.
The chances of Rooney being rested for the Sunderland game increased after it emerged that fellow striker Robin van Persie could make his return from a six-week knee injury layoff.
Van Persie, who has scored 23 goals in 29 appearances for club and country this season, returned to training last week and Giggs has been pleased by the Holland striker's progress.
"Robin has looked good in training this week," Giggs said.
"We will see (after training) today whether he is ready for tomorrow."
Giggs could start with Danny Welbeck up front after the striker impressed on a rare start against Norwich last weekend.
Juan Mata is also pushing for a place in the starting XI after he came off the bench to score twice in the 4-0 win against the Canaries.
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